Duplex davits apparatus.



B. GIANESE.

nuPLEx nAvns APPARATUS APPLICATION FILED IULY 24. 1913. 1,134,118 Patented Apr.6,1915.

2 SHEETS-SHEET 1.

THE NRRIS PETERS COA, FHOTG-LITHO.. WASHINGTON. D. C.

B. GIANESE.

DUPLEX DAVITS APPARATUS. APPLICATION FILED IuLY 24.1913.

Patented Apr. 6, 1915.

2 SHEETS-SHEET 2- Fz'gc j' THE NORRIS PETERS CO.. PHOTO-LITHD.. WASHINGTON, D. C.

entre s BENVENUTO GIANESE, OF GENOA, ITALY.

:DUPLEX DAVITS APPARATUS.

Speccaton of Letters Patent.

Patented Apr. 6, 1915.

Application led July 24, 1913. Serial No. 780,862.

To all 'whom it may concern:

Be it known that l, BENVENUTO GIANESE, a subject of the King of ltaly, residing at Genoa, gentleman, whose post-office address is 8O Corso Firenze, Genoa, italy, have invented a new and useful lDupleX Davits Apparatus, of which the following is a specification.

The object of my present invention is to provide an improved device by which in one rapid operation carried out by a limited crew, and even one person, two boats placed the one above the other, on or outside board, may be lowered without going to the trouble of turning the davits home and hauling in the tackles, as was necessary hitherto for lowering a second boat after the first with the ordinary means.

My new device comprises two additional davits with circular movement coupled to the ordinary davits in a different way the one from the other, so that it is possible to operate the whole series comprising two double davits by the mechanical action imparted only to one of them by a worm gear and wheel.

In order that my invention may be more clearly understood l am now going to describe same with reference to the annexed drawings in which- Figure l is a side view showing a series of boats davits, Fig. 2 a horizontal projection of davits with boats, Fig. 3 a diagram matical horizontal view showing the position of the davits on quarter-deck, Figs. et and 5 are groups of davits with the operative organs in section; Fig. 6 is a plan view of Fig. 5; Fig. 7 a detail view showing the connection of the additional davit to the ordinary one, Fig. 8 a plan view of worm gear and wheel, Fig. 9 a section on line a-a of Fig. 4:, Fig. l() a section on line b-b of Fig. 4, Figs. 11 and l2 ball bearings for operating the additional davit, and Fig. 13 is a detail sectional view of one of the base supports for the main davits.

In the present case both the ordinary and additional davits are supposed to be equipped with their tackles, the top boat being the first to be swung ofl' board and lowered, the additional davits with the tackles thus being in perpendicular position over the second or bottom boat to be suspended so that as soon as the first boat is disengaged from the tackles the second boat is raised from the supporting deck, swung outward, and then lowered down.

lf it is desired to keep boats suspended outside board both the first and second davits may be used to support the boats at all times while not in use. In this case the operation of lowering is almost instantaneous, as all of the boats may be hooked to the tackles and kept ready or suspended under the davits.

Fig. l of the drawings shows a series of davits comprising the ordinary ones N N, which are journaled in bearings n and n', and two additional ones A A. One of the bearings n. is shown in detail in Fig. 13. The additional davit A on which the supports -s- -sare fixed is coupled to davit N by inserting the latter through bearing openings provided for the purpose in the supports. When the said davit A is coupled to N it is capable of freely swinging about N, in the same way as, for instance, a double armed crank loose on its shaft is capable of turning about the latter. rFherefore the supports -s- -swhile fixed to davit A are loosely connected to davit N, so that these davits are capable of moving and turning independently of each other. Beneath the bottom supports -s- (Fig. 4:) and within a groove provided in each of the two half steel rings Figs. l1 and 12, fitted ferrulelike to davit -N-, are placed balls of tem pered and nickeled steel. Davit A which with support -8- bears von the half-ferrule above the balls is capable of rotating, with minimum friction and thus requires little eort in operating it. Support -sonly serves as guide and point of support.

ln order to avoid useless friction and facilitate the rotary movement of the ordinary davits N N, in the main or bottom support H (see also Fig. 4) a plate of tempered steel is placed, having a central point or spike in which bears the whole weight of davits N N. The hollow space is filled, when mounting the davits, with tallow or fat. rfhe additional davit A, on the other hand, is adjustably mounted upon the ordinary davit N, but is adapted to be rigidly coupled to the davit N. ln this case the two supports dr# -rof davit A are so fixed to davit N as to form a rigid whole, where the arms of the two davits A and N form an angle to each other which is gen.- erally of 90 if the two lifeboats to be hanboats are arranged partly overlapping and dled are superposed, whether both are to be swung home, i. e. inside board, or one suspended outside board and the other'inside board. The said two arms ofthe davits may, onfthe other hand, form an angle of 4 5", or a little greater, to each other if the also in case of complete superposition. The said davit A is always coupled to davit N at a fixed optional angle which depends from the position of theboats being more or less overlapping. To the ordinary davit Y N a gearing I is coupled, which is operated by a worm gear -Q)- and crank M on standard C fixed onf the tails shown in Fig. 5).

*J2-,- is a double bridled arm fixed on the one hand to the screw threaded standard whileV on the other hand at '-d it allows davit N to move freely. The said double bridled arm -bserves for vkeeping the distance between the aXes ofstandard C and and n, may take the positions shownY in dot? which former position is also shown in Fig. 3, direction P I (inboard or home position of davits).

Fig. 2 shows how a single man by operating in two movements the crank MV may swing out two boats, controlling, when swinging the boats outside board, the whole series of davits, as by turning crank M davit N is swung out, and therewith the suspended part of the top lifeboat.' The opposite davit, which is capable of freeand independent movement, follows the movement "of vthe boat imparted to it by davit Nl throughcrank M, worm oand gearing I. When davit N has been brought into such a position as to lower the boat, also davit N will be outside board, being obliged `to follow the movement of the boat. The Y boat isthereby almost entirely outside board by the mechanical movement imparted only to davit N. After the first boat is lowered the davits N and N are outside board in the Yposition taken by them for the carried-out f operation. The'tackles belonging to these davits remain hanging outside board, and

Copies Vof this `patent may be obtained for quarter-'deck` (de- Y eration, is in position T, Fig. 2.

it is not necessary to haul themv in. yDavit A which in'Fig. 2 is'fixed at an angle of about S5OV to the arm of davit N has been brought, by the preceding operation, to the new positionA A adapted forV hoisting up Hthe lower boat Awhich is resting upon the deck, thereby moving the perpendicularly suspended tackle to the point of attachment. Of course, lalso from the opposite side the davit A which also may be in one of the positions pf p-,-p -.20-` passes to operative position when the block has been hooked on to the point of attachment and suspension owing to the fact that this davit is lfree for movement independently of davit N f After the lower f boat has been hoisted up, crank M is turned farther thereby acting on the worm gearing. Vhile davit A',-

from positionV A is moved to position A",

davit N passes to position N, while'davit A (which follows the movement of the boat imparted to the latter by manual operation of davits A and N) passes first to position and direction -pand then to position and direction'-p-. become disengaged by the preceding operation and' is now useless for the second op- Fig. 3 shows diagrammatically the positionof the davits on the quarter-deck. The

1 position in direction and side P I is the one Y occupied by the davits when the lifeboats are home, while position P E is the one .oc-Y

cupied by the davits outside board after the first boat has been lowered and the'second is being lowered. Y

Having now fully described my saidV invention and the manner in which the same is to be performed, I declare that what I claim as my invention is: Y

An improved boats davits device com-Y prising apair of main davits mounted for oscillation on verticalaXes,rmeans,by which one of the main davits maybe operated, an additional davit pivotally connected to the Davit N which has Y.

other main davit for independentmovement on a vertical axis, an additional davitmounted upon the operable main davit for horizonf tal adjustment angularly with respect to the last named main davit, and means for securing the last named additional ydavit fiXedly lin adjusted position upon the main davit supporting the same.

In testimony whereof I havesigned my name to this specification in the presence of two subscribing witnesses.

BENVENUTO GIANEsE. Y

Witnesses Y l BAGV SmGIBECoHI,

ANGELO SoRAzNIo.

ve cents each, by addressing the Commissioner of .Patenti Washington, D. C. 

